Possible Transmission problem
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Junior Member
Joined: Aug 2004
Posts: 3
Likes: 0
From: Rhawnhurst, NE philadelphia
Possible Transmission problem
Alright i took my Ford Exlporer to a shop & they they tester on it. They came up w/these two codes: 1) P0420-bank1, 2)P0304 cylinder 4 misfire. Does anybody have an idea as to my next step?
Senior Member
Joined: Oct 2003
Posts: 549
Likes: 1
From: Arizona
The P0420 is a catalyst below normal, but that could be caused by the P0304 misfire. Find out why the #4 cylinder in the firing order is misfiring, and that should fix both codes.
Check the spark plug and coil that are firing that cylinder.
Check the spark plug and coil that are firing that cylinder.